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Al-Qaida tipsheet on avoiding drones found in Mali

The success of some of the tips will depend on the circumstances and the model of drones used, Leighton said. For example, from the air, where perceptions of depth become obfuscated, an imagery sensor would interpret a mat stretched over the top of a car as one lying on the ground, concealing the vehicle.

New models of drones, such as the Harfung used by the French or the MQ-9 "Reaper," sometimes have infrared sensors that can pick up the heat signature of a car whose engine has just been shut off. However, even an infrared sensor would have trouble detecting a car left under a mat tent overnight, so that its temperature is the same as on the surrounding ground, Leighton said.

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Unarmed drones are already being used by the French in Mali to collect intelligence on al-Qaida groups, and U.S. officials have said plans are underway to establish a new drone base in northwestern Africa. The U.S. recently signed a "status of forces agreement" with Niger, one of the nations bordering Mali, suggesting the drone base may be situated there and would be primarily used to gather intelligence to help the French.

The author of the tipsheet found in Timbuktu is Abdallah bin Muhammad, the nom de guerre for a senior commander of al-Qaida in the Arabian Peninsula, the Yemen-based branch of the terror network. The document was first published in Arabic on an extremist website on June 2, 2011, a month after bin Laden's death, according to Mathieu Guidere, a professor at the University of Toulouse. Guidere runs a database of statements by extremist groups, including al-Qaida in the Islamic Maghreb, and he reviewed and authenticated the document found by the AP.

The tipsheet is still little known, if at all, in English, though it has been republished at least three times in Arabic on other jihadist forums after drone strikes took out U.S.-born cleric Anwar al-Awlaki in Yemen in September 2011 and al-Qaida second-in-command Abu Yahya al-Libi in Pakistan in June 2012. It was most recently issued two weeks ago on another extremist website after plans for the possible U.S. drone base in Niger began surfacing, Guidere said.

"This document supports the fact that they knew there are secret U.S. bases for drones, and were preparing themselves," he said. "They were thinking about this issue for a long time."

The idea of hiding under trees to avoid drones, which is tip No. 10, appears to be coming from the highest levels of the terror network. In a letter written by bin Laden and first published by the U.S. Center for Combating Terrorism, the terror mastermind instructs his followers to deliver a message to Abdelmalek Droukdel, the head of al-Qaida in the Islamic Maghreb, whose fighters have been active in Mali for at least a decade.

"I want the brothers in the Islamic Maghreb to know that planting trees helps the mujahedeen and gives them cover," bin Laden writes in the missive. "Trees will give the mujahedeen the freedom to move around especially if the enemy sends spying aircrafts to the area."